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amarnath reddy
Warnings : 1
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Joined: 08 Feb 2006
Posts: 3
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hi all
goog morning.
i have a dought in jcl.
how will identify wherther the dataset is input data set or output dataset.
any ine knows give the correct answer.
Amarnath Reddy
TITLE EDITED |
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priyesh.agrawal
Senior Member
Joined: 28 Mar 2005
Posts: 1448
Location: Chicago, IL
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amarnath reddy,
If you have doubt in JCL ..then why to post in Job Vacancies... 
Please follow rules properly.
By looking at JCL you can not always identify that dataset is an I/p or O/p, for making these things clear we use significant DD Name, DSN Name.
Also I/p file will not being created at the step... so also have a look at DISP Parameter.
Regards,
Priyesh. |
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rssomm
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Joined: 05 Jun 2005
Posts: 41
Location: Hyderabad
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| You can't identify with just JCL..Unless ur company has certain naming standards for input an output data sets. |
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unni_nss
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Joined: 20 Sep 2005
Posts: 19
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See befor executing your JCL,in ur COBOL pgm u might have assigned two files to device.
Like SELECT INPUT_FILE TO DISK1 and SELECT OUTPUT_FILE ASSIGN TO DISK2.
In jcl u must mention this device names as ddnames.So after seeing the stepnames u will know about.The input file will be having the input dat source and output file in which the cobol program is writing the output.
Thanks,
UNNI. |
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anuradha
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Joined: 06 Jan 2004
Posts: 247
Location: Hyderabad
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| rssomm wrote: |
| You can't identify with just JCL..Unless ur company has certain naming standards for input an output data sets. |
Why can't JCL help. I mean Disp parameter is enough to identify right?
What is the other way we can code the output dataset in JCL. Just curious!!! |
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Frank Yaeger
DFSORT Developer
Joined: 15 Feb 2005
Posts: 7129
Location: San Jose, CA
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| Quote: |
| Why can't JCL help. I mean Disp parameter is enough to identify right? |
Wrong. For example, if the DISP says OLD, the data set might be used for either input or output.
This DD statement:
//DD1 DD DSN=MYDATASET,DISP=OLD
can be used for an existing catalogued input or output data set. If the data set is opened for input, it can be used as input. If the data set is opened for output, it can be used as output. The program controls whether the data set is used for input or output.
It is certainly possible in some cases to tell from the DD statement if a data set is used for input or output, but not in all cases. |
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anuradha
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Joined: 06 Jan 2004
Posts: 247
Location: Hyderabad
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| Frank Yaeger wrote: |
| Quote: |
| Why can't JCL help. I mean Disp parameter is enough to identify right? |
Wrong. For example, if the DISP says OLD, the data set might be used for either input or output.
This DD statement:
//DD1 DD DSN=MYDATASET,DISP=OLD
can be used for an existing catalogued input or output data set. If the data set is opened for input, it can be used as input. If the data set is opened for output, it can be used as output. The program controls whether the data set is used for input or output.
It is certainly possible in some cases to tell from the DD statement if a data set is used for input or output, but not in all cases. |
Hmmm.You got it right!
Thanx for the Insight frank! |
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punitsurana
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Joined: 17 Jan 2006
Posts: 6
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| I think the DISP=(,CATLG) or DISP=(,PASS) indicates that it is a Output Dataset. Also if an LIKE= Parameter is coded, then the dataset should be a Output Dataset. |
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